Few months ago, I went with the common LS1 style, plug in MAP sensor from EFI Source.

It worked great for a while, but a few weeks ago, as soon as any boost was seen, the car would misfire, buck, break-up, etc...

Discovered low fuel pressure at idle (35-38 psi) and an immediate drop to zero psi with key turned off.
Found a split in the intank Racetronix dual pump setup, on the primary pump's hose. Fixed that and thought I had fixed the problem..
That DID fix the fuel delivery issue....Now 65psi, and 75 psi when 2nd pump is manually triggered.

Anyway....the fuel delivery was NOT the issue with the weird AFR's and timing drops under load...evidently, found that problem by accident.

Fast forward and viewing several recent datalogs, I see the MAP readings all over the place. Sometimes, 90 kPa, sometimes 40 or so...at idle. Car has a near stock acting cam...usually makes 16-17" of vacuum in gear @ 800 rpm.

Go to get another sensor, and the one I have, is Out Of Stock....so I order a Delphi "brick style", and change the pigtail.
I have my MAP sensor remotely mounted. IE, sensor is on top of intake, with a boost/vacuum hose connected to it, and verified to read both.

Now...the "brick style", advertised on Amazon, as a 3 BAR...WAS evidently, a 1 bar...This seemed to have "fixed" the misfire/breaking up problem, but the first time I made any boost, the MAP sensor failed to a full time 5 volt reading, which was 320 kPa, and showing 31# of boost, LOL. It reads 0 kPa Key On, Engine Off, but pegs to 320 kPa as soon as engine starts, or tries to...

Obviously, this made the car so rich, it barely ran...In fact, I had to reflash the MAP sensor scaling to read no higher than 90 kPa, so I could get the car fired up and back into the shop...

So, after the book I just wrote...
Cliff Notes:

What DEPENDABLE MAP SENSOR are you guys using?

I am thinking of the German made, Chevrolet Performance one for the ZL1/ZR1....

I will not be trying another one from EFI Source, even when it is available...and not concerned with yet another pigtail swap...Just want to drive my car again. It's been 2 weeks of dicking around with it.

I also don't really want to try another DELCO or DELPHI, since they're made either in China or Japan now, according to their boxes...

 

in for suggestions here

 

 

I have the Holley 3 BAR 554-107 as MAP and the 5 BAR 554-108 as dome pressure and have had no issues with either. They're kinda pricey though.

I've used these cheap transducers from ebay for other items but not for MAP https://www.ebay.com/str/industrials...cat=2911276017

 

In for info on this as well. I have had the 3 bar ls1 style from EFI Source on my car for 3 years and no issues. Went to buy the same for the 4.8/turbo Rambler Im working on and went with the other "GM Style" they have in stock. Have not fired the car yet but hope to in 2 weeks. Anyone have feedback on the brick style with pigtail EFI Source sells?

 

ZR1 map, made in germany.

 

I got a bwd 3 bar sensor from advance auto.Had to dig through the net to find it but it fits the 80s turbo transam iirc.

 

After one POS sensor from EFI Source, and one POS sensor from Amazon...

Decided to go to my local dealership.
Here's what I went with...

GM part # 12592525 (list price: $45.53, for the ZR1/ZL1 3 bar MAP sensor itself)
GM part # 13585850 (list price: $38.67, for the required pigtail)
Paid $71.41 with tax, for both...$36.42 sensor, $30.94 pigtail, $4.05 tax

ZR1 MAP SENSOR WIRING: (FWIW, Pins on this sensor are NUMBERED, NOT lettered)
Pin #1 = TAN 5 volt reference wire (might be GREY, hard to tell w/ my old eyes, lol)
Pin #2 = BLACK Ground wire
Pin # 3 = GREEN sensor to pcm signal wire

Can't remember who, but I saw a plug & play adapter, so that your LS1 MAP harness plugged into the adapter, then plugged right into the new sensor.
I chose to simply cut off the pigtail I just put on the other day (for the GM "Brick" style sensor), and spliced in the new pigtail/harness. It's roughly a foot long, so since my MAP is connected remotely, I have it over close to it's vacuum source...near the brake booster. The pigtail actually comes with decent weatherproof butt connectors, made to be heat shrunk after crimping.

HPTuners SETTINGS:
LINEAR: 312.50
OFFSET: -11.25

 

BWD is the biggest shitpile company ever. Will never buy their crap again.

A Genuine GM ZR1 map sensor can be had on ebay for around 35/40 bucks, or the same as a china efi source one. A $10 direct wiring connector can be bought there also so no wire spicing or re-pinning needed. Here is one pictured here

 

DPE 2.5 Bar...

I believe it uses the Motorola MAP.